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[Xen-devel] Question about time measure in Guest Windows

  • To: <xen-devel@xxxxxxxxxxxxxxxxxxx>
  • From: XuNanxuan <nanxuan_xu@xxxxxxx>
  • Date: Thu, 4 Dec 2008 06:44:55 +0000
  • Delivery-date: Wed, 03 Dec 2008 22:45:20 -0800
  • Importance: Normal
  • List-id: Xen developer discussion <xen-devel.lists.xensource.com>

I intend to use RDTSC to make some time tests in Xen guest WinXP. However, from Intel Developer's Manual I noticed that RDTSC will cause VMExit if "RETSC exiting" VM-Execution control field is 1. So I wonder: How to query VM-Execution control field in a programmable way?
BTW: On Intel Developer's Manual, it mentioned a method using IA32_VMX_PROCBASED_CTLS MSR, but this is just to report which bits can be set on processor-based VM-EXECUTION controls, rather than telling you the content of this structure.

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